<template>
  <div class="xtx-cart-page">
    <div class="container m-top-20">
      <div class="cart">
        <table>
          <thead>
            <tr>
              <th width="120">
                <!--
                  如果所有项都选中 就是true
                  但凡有一项没选中 就是false
                -->
                <XtxCheckbox :model-value="$store.getters['cart/isAll']" @change="allCheck">全选</XtxCheckbox>
              </th>
              <th width="400">商品信息</th>
              <th width="220">单价</th>
              <th width="180">数量</th>
              <th width="180">小计</th>
              <th width="140">操作</th>
            </tr>
          </thead>
          <!-- 有效商品 -->
          <tbody>
            <tr v-for="i in cartList" :key="i.id">
              <td>
                <!--
                   v-model因为语法糖的关系会直接对i.selected做出修改
                   直接赋值修改 不走mutation
                   所以就报错了

                   解决办法：不用v-model回归到传统的组件通信方式

                   方向一：父传子的方式 完成组件的回显 :model-value = 'vuex数据'
                   方向二：子传父的方式 把组件中最新的状态修改到vuex中的state (mutation)
                -->
                <XtxCheckbox
                  :model-value="i.selected"
                  @change="(selected) => checkChange(i, selected)"
                />
              </td>
              <td>
                <div class="goods">
                  <RouterLink to="/">
                    <img :src="i.picture" alt />
                  </RouterLink>
                  <div>
                    <p class="name ellipsis">{{ i.name }}</p>
                    <!-- 选择规格组件 -->
                  </div>
                </div>
              </td>
              <td class="tc">
                <p>&yen;{{ i.price }}</p>
                <p>
                  比加入时降价
                  <span class="red">&yen;20.00</span>
                </p>
              </td>
              <td class="tc">
                <XtxNumber :is-label="false" :model-value="i.count" @change="numChange" />
              </td>
              <td class="tc">
                <!-- 小计：当前项的单价 * 数量 -->
                <p class="f16 red">&yen;{{ i.price * i.count }}</p>
              </td>
              <td class="tc">
                <p>
                  <a class="green" href="javascript:;">删除</a>
                </p>
              </td>
            </tr>
          </tbody>
        </table>
      </div>
      <!-- 操作栏 -->
      <div class="action">
        <div class="batch">
          共 {{ allCount }} 件商品，已选择 {{ selectedCount }} 件，商品合计：
          <span class="red">¥{{ selectedPrice }}</span>
        </div>
        <div class="total">
          <XtxButton type="primary" @click="goSettle">下单结算</XtxButton>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import { computed } from 'vue'
import { useStore } from 'vuex'
import Message from '@/components/Message/index.js'
import { useRouter } from 'vue-router'

export default {
  name: 'XtxCartPage',
  setup () {
    // .vue组件 useStore  .js文件 import使用
    const store = useStore()
    const cartList = computed(() => store.state.cart.cartList)
    // watch computed
    // computed: 计算相关 数据  watch: 数据变化的时候执行一段自己的逻辑(重点)
    const allCount = computed(() => store.getters['cart/allCount'])
    const selectedCount = computed(() => store.getters['cart/selectedCount'])
    const selectedPrice = computed(() => store.getters['cart/selectedPrice'])

    // 单选框选择
    function checkChange (i, selected) {
      console.log(i, selected)
      // 找到vuex中对应的数据项 把selected通过走mutation修改到对应的字段上
      // 1. 找到对应项 (缺少一个标识 id) 2. 定义一个 commit
      // 如何除了selected之外还需要传下来当前点击了谁
      // store.commit('cart/singleCheck', {
      //   skuId: i.skuId,
      //   selected
      // })
      store.dispatch('cart/asyncSingleCheck', {
        skuId: i.skuId,
        count: i.count,
        selected
      })
    }
    // 全选
    function allCheck (selected) {
      store.dispatch('cart/asyncAllCheck', selected)
    }

    // 数量
    function numChange (count) {
      console.log(count)
    }

    // 结算
    const router = useRouter()
    function goSettle () {
      if (selectedCount.value === 0) {
        return Message({ type: 'warn', text: '请至少选择一项' })
      }
      router.push('/settle')
    }
    return {
      cartList,
      selectedCount,
      allCount,
      selectedPrice,
      checkChange,
      allCheck,
      goSettle,
      numChange
    }
  }
}
</script>

<style scoped lang="less">
.tc {
  text-align: center;
  .xtx-numbox {
    margin: 0 auto;
    width: 120px;
  }
}
.red {
  color: @priceColor;
}
.green {
  color: @xtxColor;
}
.f16 {
  font-size: 16px;
}
.goods {
  display: flex;
  align-items: center;
  img {
    width: 100px;
    height: 100px;
  }
  > div {
    width: 280px;
    font-size: 16px;
    padding-left: 10px;
    .attr {
      font-size: 14px;
      color: #999;
    }
  }
}
.action {
  display: flex;
  background: #fff;
  margin-top: 20px;
  height: 80px;
  align-items: center;
  font-size: 16px;
  justify-content: space-between;
  padding: 0 30px;
  .xtx-checkbox {
    color: #999;
  }
  .batch {
    a {
      margin-left: 20px;
    }
  }
  .red {
    font-size: 18px;
    margin-right: 20px;
    font-weight: bold;
  }
}
.tit {
  color: #666;
  font-size: 16px;
  font-weight: normal;
  line-height: 50px;
}
.xtx-cart-page {
  .cart {
    background: #fff;
    color: #666;
    table {
      border-spacing: 0;
      border-collapse: collapse;
      line-height: 24px;
      th,
      td {
        padding: 10px;
        border-bottom: 1px solid #f5f5f5;
        &:first-child {
          text-align: left;
          padding-left: 30px;
          color: #999;
        }
      }
      th {
        font-size: 16px;
        font-weight: normal;
        line-height: 50px;
      }
    }
  }
}
</style>
